Transmitting mechanism.



No. 765,623. PATENTED JULY 19, 1904. J. J. KOUMAN.

TRANSMITTING MECHANISM.

APPLIGATION FILED JUNE 12. 1903.

WITNESS/5S.'

N0 MODEL.

No. 765,623'. PATENTEn'JULY '19, 1904.

' V J. J. KooMAN.

TRANSMITTING MEGHANISM.

- APPLICATION FILED JUNE 12. 1903.

3 SHEETS- SHEET 3.

,Np MODEL.

Patented July 19, 1904.

PATENT OEEICE.

' JULIUS JACOB KOOMAN, OF NEW YORK, N. Y.

TRANSMITTING MECHANISM.

SPECIFICATION forming part ofLetters Patent No. 765,623, dated July 19, 1904.

Application tiled June 12, 1903.

T0 all whom it may concern: 5V"

Be it known that I, J ULIUs J AcoB KooMAN, a citizen of the United States, and a resideiit of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Im proved Transmitting Mechanism, of which the following is a full, clear, and exact description.

This invention relates to a gearing which may be used -for the mechanical transmission of power for all purposes. It is here shown as employed in'connection with a bicycle; but I desire it clearly understood that the invention is not so limited. It may be applied to engines, manual powers, and for any other purpose requiring the mechanical transmission of'motion.

This specification is an exact description of one example of the invention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation showing the invention applied to a tandem bicycle. Fig. 2 is a horizontal section on the line 2 2 of Fig. 1. Fig. 3 is a sectional elevation looking from the line 3 3 of Fig. l, but showing the pedals vertical instead of horizontal, as in Fig. 1. Fig. 3u is a fragmentary perspective vie'w of the parts shown in Fig. 3. Fig. 4 is a fragmentary view showing the invention applied to 4a single-seat bicycle, and Fig. 5 is a rear elevation of the gearing shown in Fig. 4.

Referring to Figs. 1, 2, and 3, 10 indicates the rear or driving wheel of the bicycle, and 11 the hub thereof, this hub being mounted loosely on a sleeve 12, held rigidly in the frame 14 of the vehicle. On said hub 11 is secured a sprocketwheel 15. 16 indicates a crankshaft, which is mounted loosely in the sleeve 12, and 17 indicates a sprocket-wheel attachedY 22 are each provided with a wrist-pin 23, and

Serial No. 161,171. (No modelJ said wrist-pins facilitate the connection with Vthe crank-arms of links 24. These links are located one on each side of the machine and extend up, respectively, to the long arms 25 of elbow-levers fulcrumed at the point 26 and located one on each side of the machine. Said arms 25 of the elbow-levers are provided withtrusses 27, which strengthen them, and the short arms 28 of the levers are braced against the long arms by means of diagonal struts 29.

Said short arms 28 of the` elbow-levers are respectively connected with links 30, which extend forward, one on a crank 31,y fastened on the right-hand end of a shaft 32, and the other to a gear 33, fastened to the left-hand end of said shaft and serving the double purpose of a gear and crank. The gear 33 is in mesh with a gear 34, fastened to a shaft 35 below the shaft 32. I Said shaft 35 also carries a sprocket-wheel 36, fast to the shaft, and over this wheel a chain 37 passes, the chain extending rearward to and around the before-described sprocket-wheel 15.

In the operation of the apparatus the power applied to the shaft 2O is transmitted to the rear crank-shaft 16, and being here reinforced by the power applied to the rear cranks 22 the aggregate power is transmitted by the links 24-to the elbow-levers, which, owing to the arrangement shown, exert great leverage on the shaft 32 and cause the same to be driven at a very high speed. From the shaft 32 the movement passes to the shaft 35 and from this shaft to the driving-wheel 10 by means of the geared elements 36, 37, and 15. This gearing provides for the exertion of great leverage on the part to be driven, and in case of the bicycle here illustrated it will enable the bicycle to be propelled at a high rate of speed with the expenditure of less energy than is commonly employed in thi-s class of machinery.

The construction shown in Figs. 4 and 5 does not differ essentially from that shown in Fig. 1, except that it shows the invention applied to a single-saddle machine. In Figs. 4 and 5, 38 indicates the crank-shaft, to which the cranks 39 are connected. The said cranks are connected t0 links 40, and these in turn are connected with the long arms of the elbow- IOO levers'41, which levers are two in number and the long arms of which are guided by suitable straps 42, secured to the frame 43 of the bicycle. The long arms of the elbowlevers 4l are trussed, as before described, and their short arms 44 are braced by means of struts 45. These short arms have links 46 connected thereto, and said links are also connected to the cranks 47, fastened to the shaft 48, mounted in the rear portion of the frame 43, this shaft being in axial coincidence to the rear or driving wheel 49. The shaft 48 carries a spur-gear 50, which is in mesh with a pinion 5l on a stub-shaft 52, mounted in the frame just forward of the shaft 48. The shaft 52 also carries a spur-gear 53, which is in mesh with a pinion 54, fastened to the hub 55 of the driving-wheel. In this type of the invention the operation is the same as that before described, excepting that it is simplified,

. owing to the simplification of the operative parts. It should be understood that the frame of the bicycle is not an essential element of my invention. This may be constructed in any manner which is desirable or necessary.

Various changes in the form, proportions, and minor details of my invention may be resorted to at will without departing from the spirit and scope thereof. Hence I consider myself entitled to all such variations as may lie within the intent of my claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. The combination of an elbow-lever, a link connected to each end thereof, two revoluble shafts, and a crank on each of-said shafts, the cranks having respectively connection with the elbow-lever, and said elbow-lever having one arm longer than the other and provided with truss-rods extending above and below it, the short arm of the lever being braced from the longer arm by a diagonally-extending strut.

2. The combination with two driving-shafts and with a rotary driven member, of gearing connecting the two driving-shafts, an elbowlever having along arm and a short arm, a connection between one driving-shaft and the long arm of the elbow-lever, a link connected to the short arm of the elbow-lever, a crankshaft with which the link is connected to drive the crank-shaft, a second shaft, gears connecting the 'crank-shaft and the second shaft, and gearing extending between said second shaft and the said driven member.`

3. The combination with two driving-shafts and a rotary driven member, of an elbow-lever having a long and a short arm, a connection between one driving-shaft and the long arm of the elbow-lever, a rotary shaft, gearing connecting said shaft with the short arm of the elbow-lever, said gearing including a link attached to the elbow-lever, and a crank-shaft connected to the link, gearing extending between the said'rotary shaft and thesaid driven member, and gearing connecting the firstnamed driving-shaft with the second or remaining driving-shaft.

4. The combination with a rotary drivingshaft and arotary driven member, of a crank connected to the driving-shaft, a link connected to the crank, an elbow-lever having a long and a short arm, the long arm being connected to the said link, a crank-shaft, a link connected to the short arm of the'lever and to the said crank-shaft, and gearingconnecting the said crank-shaft with the said rotary driven member.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

JULIUs JACOB Kooi/IAN.

. Witnesses:

RnMsEN RUsHMoRE, JACOB G. PREGENSER. 

